Foreman, W.T., Majewski, M.S., Goolsby, D.A., Wiebe, F.W., and Coupe, R.H., 2000, Pesticides in the atmosphere of the Mississippi River Valley, part II--air: The Science of the Total Environment, vol. 248, p. 213-216. doi: 10.1016/S0048-9697(99)00544-6 Available Online

Fisher, L.H., and Healy, R.W., 2008, Water movement within the unsaturated zone in four agricultural areas of the United States: Journal of Environmental Quality 2008 (37), p. 1051-1063. doi: 10.2134/jeq2006.0561 Available Online

Falcone, J.A. and Wong, D.W., 2012, Mapping urban land uses in the United States by census zone using nationally available data: Journal of Land Use Science, 24 p. doi: 10.1080/1747423X.2012.679749 Available Online